/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.cmd;

import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.TaskEntity;
import org.activiti.engine.task.DelegationState;

/**


 */
public class DelegateTaskCmd extends NeedsActiveTaskCmd<Object> {

  private static final long serialVersionUID = 1L;
  protected String userId;

  public DelegateTaskCmd(String taskId, String userId) {
    super(taskId);
    this.userId = userId;
  }

  protected Object execute(CommandContext commandContext, TaskEntity task) {
    task.setDelegationState(DelegationState.PENDING);
    if (task.getOwner() == null) {
      task.setOwner(task.getAssignee());
    }
    commandContext.getTaskEntityManager().changeTaskAssignee(task, userId);
    return null;
  }

  @Override
  protected String getSuspendedTaskException() {
    return "Cannot delegate a suspended task";
  }

}
